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6
includes: 76 sites operated by the Division of Air Quality; 29 sites operated by local
program agencies in Forsyth, Mecklenburg, Buncombe and Haywood Counties; 4 rural ozone
monitoring sites operated by contractors for the U. S. Environmental Protection Agency
Clean Air Status and Trends Network ( called CASTNet) and 8 sites operated by the
NADP/ NTN.
The map below ( Figure 1) illustrates the North Carolina and NADP/ NTN air monitoring
network for 1995. Each year, some sites are discontinued, and
new sites are established in response to population changes, changes in location of emission
sources, and factors such as changing availability of suitable locations for monitors. For
example, there were many more TSP monitors and fewer monitors for most other pollutants
in the 1970s than there were in 1995.

6
includes: 76 sites operated by the Division of Air Quality; 29 sites operated by local
program agencies in Forsyth, Mecklenburg, Buncombe and Haywood Counties; 4 rural ozone
monitoring sites operated by contractors for the U. S. Environmental Protection Agency
Clean Air Status and Trends Network ( called CASTNet) and 8 sites operated by the
NADP/ NTN.
The map below ( Figure 1) illustrates the North Carolina and NADP/ NTN air monitoring
network for 1995. Each year, some sites are discontinued, and
new sites are established in response to population changes, changes in location of emission
sources, and factors such as changing availability of suitable locations for monitors. For
example, there were many more TSP monitors and fewer monitors for most other pollutants
in the 1970s than there were in 1995.